These tube worms put simple drop dead at 26c.They come here from deeper waters and from the two burst of currents at near the same time each year that go north forcing the east auzy current out wide. This is once part of the plankton to be at the mercy of currents and winds.They start colonsing our waters from September and are starting to be seen from late October and in full swing by early January, sometime in the billions and dead usually by February.Thatís their life here, and if you collect them they need 25c or below to survive for any length of time in your aquarium, best at 23c and if you do this they will multiply beautifully.